Power Controlled Interleave-division Multiple-access Wireless Communication Systems

Abstract

Transmission methods of interleave-division multiple-access (IDMA) system are disclosed. An objective of the present invention is to provide a signal structure that can substantially increase the overall transmission rate and meet the requirements of different transmission rates in wireless telecommunication systems. Such requirements arise in applications such as mixed speech and data services where different services may employ different rates for transmission. Such applications are often referred as multimedia applications. The disclosed transmission method includes an extra power control operation applied to output of an IDMA transmitter.

1 . A method for IDMA signal transmission, comprising the steps of: 
 (a) assigning a code to each user, where the said code can be the same or different for different users and of the same or different rates for different users, and    (b) encoding the source data sequence for each user using the encoder assigned to this user, and    (c) interleaving the said coded sequence so as to modify the order of said coded sequence to produce the interleaved sequence, wherein interleaved data sequences from different users are distinguished by using different interleaving schemes, and    (d) assigning a pre-calculated power level to each user, where the said power level can be the same or different for different users, but these levels are different at least for some users, and    (e) transmitting the interleaved sequence for each user using the assigned power level for this user    
   
   
       2 . A method as claimed in  claim 1  wherein the codes may contain a hybrid form of narrow sense codes and repeat codes and spreading operations.